yes due to the requirement by miners in order to get the transaction go faster even there are only ~4000 unconfirmed transactions as of this reply is posted, everyone is posting a higher transaction fees. unless the majority is lowering the transaction fee to use bitcoin, the .0006 fee is normal.
Can I choose not to pay it and willing for my withdrawal to be delayed?
most of the gambling site has fixed transaction fee which is always required, and if your amount of withdrawal is not enough is even delaying your transaction longer than you would expect AFAIK, for me i had experienced with normal fee, waited 40+ minutes for a confirmation.